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> Figure 16. Total overtopping rate along project length
Figure 15. Station overtopping rates, 100-year return period
Summary and Conclusions - 2_Guam0056
2_Guam
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g
g
j
g
2000
1800
Existing
Plan
1600
1400
1200
1000
800
600
400
200
0
0
10
20
30
40
50
60
70
80
90
100
Return
Period
(years)
Figure
16.
Total
overtopping
rate
along
project
length
(To
convert
cubic
feet
per
second
to
cubic
meters
per
second,
multiply
by
0.02831685)
Two
additional
key
points
affect
interpretation
of
the
harbor
side
total
water
levels
and stage-
frequency
relationships.
First,
the
total
water
level
is
reached
only
by
the
crest
of a
wave
with
height
equal
to
the
significant
wave
height
or by
the
portion
of
crest
above
that
level
for
waves
higher
than
the
significant
wave
height.
Thus,
the
total
water
level
would
be
reached
or
exceeded
for
short
time
intervals
(several
seconds)
interspersed
with
longer
time
periods
of
lower
water
level.
Second,
the
wave
contribution
is
strongly
dependent on
reflection
coeffi-
cient
at
the
shore,
which
is
not
well-documented.
This
dependence
is
especially
important
at
the
two
most
exposed stations
(Stations
11 and
12),
where
a
reflec-
tion
coefficient
of
0.5
was
used.
Reflection
coefficient
at
the
more sheltered
stations,
with
highly
oblique
exposure to
the
open
harbor
(Stations
6
through
10),
was
reduced to
0.1.
44
Chapter
5
Development
of
Overtopping
and
Stage-
Frequency
Relationships
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